The Ih'valla was a rank in the D'jarra system on Bajor that was comprised of artists. Before 2318, Darrah Karys, a member of the Ih'valla, married Darrah Mace, a member of the Ke'lora caste. This marriage was frowned upon by Karys's family and they caused difficulties until the couple had children. (ST - Terok Nor novel: Day of the Vipers) Proka Etra's grandparents were members of the Ih'valla caste. (DS9 novel: The Never-Ending Sacrifice)